Perkins 4.108M DIY Rebuild -- A Narrative - Page 17 - SailNet Community
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post #161 of 268 Old 04-05-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Some of the engines we rebuilt in my business had the "broken" rods/caps, I always assumed it was so they could only be put together one way but don't really know. Might have been Perkins, or maybe JDeere, but we had a bunch of different brands.

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post #162 of 268 Old 04-05-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

I know that Perkins engines were used in a lot of different brands of equipment so they may have been the same!
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post #163 of 268 Old 04-05-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

They were even used in the classic black London taxicabs.

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
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post #164 of 268 Old 04-05-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Since the bearing surface that moves is on the crankshaft surface, and the bearings are stationary in the rods, wouldnt it make sense to get the undersized bearings, and turn the crank rod journals down the appropriate dimension, after determining your min/max. measurements with plastiguage?

Why, why, why?
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post #165 of 268 Old 04-05-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

I certainly could do as you have suggested and install 0.010 inch undersize bearings and then "tune" the crankshaft to match the installed bearings by grinding and re-nitriding (Tufftride is the proprietary name) the crankshaft. In fact I used to do almost exactly that on my race motors, although for entirely different reasons...I would have the machine shop finish the crankshaft to 0.0005 inch larger than I really wanted. Then I would hand polish the crankpins and journals with increasingly fine sandpaper and a shoestring to get the exact clearance that I wanted. But that is a lot of work, and I only did it because the engines ran in excess of 9000 RPM and bearing clearances were critical in order to make the motors live.

But crankshaft grinding is forever and in this situation I'd prefer to bring the engine back to new factory specs. Rods are available out there, and it seems that they are not ridiculously expensive.
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post #166 of 268 Old 04-05-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Perkins motors are every where in some form of another. In Vietnam they drive pumps in the paddy fields, supplied village water in Fiji, power in the Marquesas and my boat. I think I should start making a a coffee table book of Perkins 4.107/108 motors being used in domestic and exotic locations.
As for New 4.108 they are being made by a number of counties. China build,
Zhejiang Xinchai Co., Ltd. called the 4108BT they also build 4105BT which looks like the old 4.99 which was the original London Taxi motor.

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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Are the Chinese parts interchangeable with their British cousins?
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

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Are the Chinese parts interchangeable with their British cousins?
This I don't know but all those engines out there in asia are getting parts from somewhere. Perkins is owned by Caterpillar, and they support factories in India and China.

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post #169 of 268 Old 04-06-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Have you by chance had any dealings with either the Chinese or Indian arms of Caterpillar? Any idea where I might start poking around?
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

SJB,

I found the answer to your question on rrconnectingrods.com's website: "The angled rod cap is used on small bore engines or for camshaft clearance."

Ray R
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